When formally attired, a bishop wears a distinctive headpiece known as a "mitre." Bishops in the Western church have for centuries worn a mitre that comes to a point at the top, as shown in this portrait of St. Ildefonso, ca. 1610, by El Greco.
Bishops in the Russian Orthodox Church traditionally wear a mitre with a broader, rounder top. Here are four quite lovely 19th-century examples from the Hermitage Museum, St. Petersburg, Russia --
Mitre, 1840s Mitre, 2nd half, 19th century Mitre, 2nd half, 19th century Mitre, late 19th century
You can see three bishops wearing mitres such as these in the Wedding of Nicholas II and Alexandra, 1895, by Laurits Tuxen.
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